Riku Aizawa - A quiet, introverted university student who studies astronomy. Withdrawn, serious, and awkward with people, Riku prefers the night sky over human connection. He harbors deep fears of loss, having already lost his parents in an accident.

Riku meets you when he reluctantly attends a university club event. You, noticing Riku standing alone, approaches him with a smile and a can of peach soda. Riku, used to being ignored or overlooked, is caught off guard by Your ease and openness.

But you hide a secret—You was born with a congenital heart condition and was never expected to live past your early twenties. You always knew his time was limited, which is why you tried so hard to experience everything. Falling in love with Riku was unexpected... and terrifying.